How they see
How does a pigeon see the world?
Five-ish colour channels, near-panoramic
The much-maligned pigeon may carry one of the finest colour systems on any city street. It is a tetrachromat, with four kinds of colour cone and light-splitting oil droplets in its eyes, so a plain grey square likely blazes with hues and ultraviolet patterns we cannot imagine. All of it wraps around its head in a near-complete panorama.
See through their eyes
Human ≈ 60 cpd (20/10)
How sharp is a pigeon's vision?
Its eyes resolve about 12.6 cycles per degree (20/48), while a human reaches around 60 cpd (20/10). Its field of view spans about 340°.
How does a pigeon see a human?
Its eyes resolve about 12.6 cycles per degree against your 60, so a face has to be roughly 5 times closer for it to pick out the detail you do. Your outline and your movement read clearly; your expression does not.
Colour comparison
How each colour shifts when seen through this animal's eyes, using the same colour model as the app. Tones a screen can't emit (such as ultraviolet) are shown as an approximation.
What colours can a pigeon see?
Extremely rich colour with an added UV channel; oil droplets finely partition the spectrum. Detects UV and polarized skylight for navigation.
Photoreceptors
Tetrachromat (4 cone types) + coloured oil droplets
Cone peak sensitivities
- UV409 nm
- S (blue)452 nm
- M (green)507 nm
- L (red)567 nm
How does a pigeon see in the dark?
Day-active; wide field for spotting aerial predators.
How does a pigeon's vision compare to a human's?
A pigeon's fine detail, about 20/48, is well below your 20/20. Beyond that it sees a fourth primary colour and ultraviolet you have no receptors for, across a sweeping 340-degree field to your 200.
What is special about a pigeon's vision?
- Sees ultraviolet
- Near-360° field
- Detects polarized light for navigation
What the research shows
Bowmaker et al. (1997) used microspectrophotometry, measuring light absorption in single photoreceptors, to describe the pigeon's visual pigments and oil droplets. They found four single-cone classes peaking near 409, 452–460, 507–514 and 567 nm, double cones near 567 nm and rods near 503 nm. Red, orange, yellow and clear oil droplets filter the light reaching each cone and add further spectral channels, which is why the pigeon is sometimes described as functionally pentachromatic. Behavioural confirmation came from Emmerton & Delius (1980), who tested wavelength discrimination across the visible spectrum and into the ultraviolet, and Hart (2001) places these findings within bird vision more broadly.
The retina is not uniform: a region rich in red oil droplets, the 'red field', differs from the surrounding 'yellow field', so colour can vary with where the bird looks. Acuity, by contrast, turns out to be similar across the field. Hahmann & Güntürkün (1993) measured about 12.6 cpd behaviourally in the lateral visual field, and Rounsley & McFadden (2005) found about 12.8 cpd in the frontal field; the page uses 12.6 cpd, roughly 20/48. Flicker fusion of about 80–140 Hz is among the highest measured in vertebrates, and the page shows 100 Hz. Four cone classes plus droplet filtering define a colour space that three screen primaries cannot hold, so raising saturation makes colours stronger without adding the hues a pigeon separates.
Guides: Animals that see ultraviolet · Which animal has the best eyesight? · All guides
Scientific sources
- Emmerton & Delius (1980)
- Bowmaker et al. (1997)
- Hart (2001)
- Hahmann & Güntürkün (1993)
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